Downdraft-furnace.



PATENTED AUG. 21, 1906.

H. F. NORWOOD. DOWNDRAFT FURNACE.

APPLICATION FILED AUG.4,1905.

' W In ventor:

Uni-rein stares PATEET cleric-n.

HORAGEFF. NORM'UOI), OF CHELSEA, MASSAUl-IUSE'VFS.

DOWNDRAFT-FURNACE.

Specification of Letters Patent,

Patented Aug. 21. lJtG.

Application filed August4,1905. Serial No. 272,648.

To 11]] whom it may con/0 77p:

Be it known. th J) I, HORACE F. N ouwoon, a citizen of the UnitedStates, residing at Chelsea, county of Suffolk, State of Masse--chusetts, huvcinvented certain new and useful Improvements inDowndraft-Furnaces,

plete combustion takes places, which furnace is simple in construction,is composed of few parts,-is ver ycompzict, not apt to get out of order,is easilyeontrolled and regulated, and readily supplied with fuel.

In the accom anying draw ngs, in which like letters of re erence indie2e like perts in all the figures, Figure 1 is a plan View of myimproved'furnuce, the draft-adjusting ring and hopper being emitted.Fig. 2 is a plan A and B, formed of tubing,the coil Abeing of lessdiameter than the coil B- and located within the coilB so as to form aspace C between the inner and outer coils A- and B,

which space will he referred to hereinafter as the fuel-space," saidcoils in the specific A end B, forming the coils A and B, project fromthe furnace at the bottom and are to be connected with a suitable supplvof water,

and the upper ends A and ll'tof these tubesor Pipes (an be carried i thedome of a steum-boiler, which boiler is heated by means of thecomlmstiou iri the furnace, or the hot water issuing from the-ends A!end B may be used. for uny other suitable pury pose or may go to waste,us the exigencies of the case may require. As shown, the severalconvolutions. of the pipes do not rest firmly upon each other, but anopen space equal to about one-fourth, more or less, of the diumctor ofthe tubes-forming the coils is left between the several com'olutions.The bottonrini f the innercoil A is also some distance beneath thebottom of the outer coil 15. These coils are contained in erasing l),preferably made ofwrought irou and of such di- :uneter as to leave anair-spnrzc E between the well of the casing and the outer face oitheoute'r coil B. able base F, upon which busithe lourrcuds of the coilsA and B rest. base has upwardly-cXtcndirig" side portions ll, whichsupport the mine iii-ultheouter coil B, thus leaving a spar-15H betweenthe bottom of the outer coil B and the upper sur' face of the base F.Openings lnrc provided in the (lXiZGYISlOIl'G of the 'l-i'itfifl'l,which openings can be closed by doors or by brick or burnt-clay platesl. The ashes accumulate around the inner coil A an i may be removed fromtime to time after the openings l have been opened; but after the asheshare been removed these openings z rc to be closed. A cast stop-plate Jrests upon the top of the casing above the coils and is pro ided withacentral opening K, from which draft-lube .li extends upward for thepurpose of conducting the products of combustion to the boiler or a.furnace for limiting meial or a kiln or to any other structure in whichthe heat is-to be used. The central opening ii is surrounded by e seriesof segmentalopenings M, formed in' the top plate J, andat the out-eredge of these openings at hopperN,surroundinn the central tube L, issecured on the plate .l.

Along, the outer edge of the top plate J a series of radial openings areformed around thecntire top plate. A flat metal ring 1 rests upon theupper surface of thetop plate J along the rim, and this ring P isprovided with openings Q of the same size as the opt-riings O in the topplate J and adapted to register therewith. lhis ring rrsts ii at upontheupper Surface of thetop plate and is ed: ted to turn upon this topplate and is held turn by means of pins R, projecting upward from the uipcr surface of the plate J. the outer 0 go of the demper-riiigQl twopins 0 project upward from the same and two pins .1; project upwardfrorn'the top plate J at the This casing rests on a suit shown, lhc

in place in such a manner that it can.

ICO

inner edge of the ilninper-ring,sotlint n vbur M Sean be insertril.l)(-:l,\\'((?l1 the two pairs oi pins a enud I) l). ns shown in Fig. 2,and the damper-ring shifted, so s'lo cause the openings in the top plateJ nnd'the open ings Q in the lmnpenring I to register co1n= and B, atthe bottom of thefurnace, may be vconnected by dpipe A, if desired. Thefuelis filled into tliQhOPPL-QI' N and passes from thesemethrough theopeningsM into the space 0 between theycoils Aend B, down- Whiehspaoe'it is passed'until the space is filled, emits the fuel isconsumed-new fuel eontinuelly supplied automatically froin the hopper atthe top,

The air required for ,(zombust-ioh enters the top of the furnacethroughthe openings 0, passes down through the 'air spaee E; surroundingthe outer coil, and possesthroughthe openings between the severaloonvolutions of. the" outer coil Bin'to and through the fuel, and thecombustion ta esplace in the'space bounded by the inilf A, in whichspace there is 110 fuel. products of combustion-pass outthrough'tlie'topopeniiigs K; and are carried oil by the duel); The Watercirculating throu 'h the pipes or tubes forming the coils A all (1 33prevents those pipes being consumed by the extrenielyg teat heat, and:it; thesaine time the Wat is heated :i'nd is converted into stenn'i tobe used'innny siiiitoble manner; as my be (It-sired;

described niy inven'timr, what I 1 claim asfinew; turd des reto' secureby Letters If 111E118downdraft furnace, the combinetion "with an; innertube-coil and an outer tubecoil speced 'therefrom to forlna fuel-:-chember, of st easing surrounding the'eoils enddraving fuel-supplyopenings irbove the 1 space between the two coils an opening for theescape 'nfthe pfoductsiof combustion above the inner eoil and air-supplyopenings above the space between the walls of the dosing and the} outercoil, substantially as set fO'Ithlj v p p 2, Info doiivndreft iuiimce,the combine tion with 1m inner tul-ie-eoil andv an outer tube-coilspacedtherefrom to forni 1 fuel a chamber between them, of a casingsurroundingthe coils and having an 0 ening for the escape of theproducts of com ustion above the inner coiland also rovided in its topwith=draft-openings leading to the space hetween the outer coil and theWalls of the case ing and means for regulating the size of thedraft-openings, substantially as set forth.

Inn downdraft furnace, the -c'o1nbination withan inner tube-coil and anouter tube-coil spaced therefrom to form a fuelch'ainberbetween-them, ofa casingsurround- 'ing the coils, stop platoon said casing, an

openin in saiditop' plate abovethe central coil a no extending frolnsaidopening upward, openings in the top plate above the space between theinner and outer coils, fuelsupply openings in'thetop late and ti-hopperon the top plate surroun ing'saidop'cnings and thefiue, substantially asset forthi ,4. In a downdraftfurnace, the c'o'mbina tionwith a casing,oftwo apertured .ehamhers-within the "casing, one chamber being-Within-the other and the chalnb'ers spa'ccd from each other-toformai'ifuel-chaniber bev I tween them, the-walls of the outer ohaniberbeing inclined downwardand outwardzi'nd the Wells of the inner: chemberbein inclined downward and inward, sub'stantia 1y asset forth.

'5. In a downdraftfurnace, the combina tion with two apertnzed'walls,one a surrounding the other,seid-wallsbeing spaced to form ah1el+cl1iunber between them, the

diameter of the inner wall gradually inert-as v ingfroni the botton tothe top and'the dianieter of the outer wall gradually decreasing I "fromthe bottom to the top, of a casing surrounding said Walls and )rovidedwith draftopenings andiilso prov! ed with fuel supply openingsat the topof the spa e between the Wells :a-nd'with an outlet-owning for theproduots of combustion above the top of the innerl'wall, substantially asset forth.

'6. In .a downdraft-furnace the combinetion with two eperture'dclnnnbers', both resting-on a common base and one surrounding the other;the diameter of the inner clu'un ber" decreasing from the downward 'andthe diameter of the outer chamber increasing; from the top downward andan outletflue at the top of the inner chamber, substantielly as setforth. I 4 1 p In testimony whereof I have signed my nonie to thisspecification iii-the presence of two subscribing witl'iesscs.

. omer? F. ronwoonl Witnesses: v

Os'oA z -F.'G sz,

Sour-rm 3L BAEDER.

I ls:

